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Serial output

Hi,

I quite new to linux, so i need some help.

I have an IR (infrared) diode and an text display. its connected to my computer via an serial cable (D9 connector i think) and in windows i type in my text and send it to the display via IR. the text is then rolling over the screen. So, how does i send data to the display (via serial to an IR diode) in linux?

The display only have an IR reciver, not an transmitter. So the IR Transmitter send data only to the display, and is`nt reciving anything.